CN115899337A

CN115899337A - Exhaust valve and electric automobile

Info

Publication number: CN115899337A
Application number: CN202211522733.2A
Authority: CN
Inventors: 魏小红; 于洋; 邬杰
Original assignee: Jiangling Motors Corp Ltd
Current assignee: Jiangling Motors Corp Ltd
Priority date: 2022-11-30
Filing date: 2022-11-30
Publication date: 2023-04-04

Abstract

The invention provides an exhaust valve, which is used for exhausting and decompressing equipment and comprises a valve body, a valve seat, a spring, a piston and a cylinder barrel, wherein the valve body comprises an umbrella-shaped valve and a one-way valve, the umbrella-shaped valve is provided with a breathable film and a hollow guide rod, the side wall of the hollow guide rod is provided with a plurality of vent holes, the end part of the hollow guide rod is provided with a one-way valve fixing hole and an air inlet hole, the valve seat is provided with an exhaust hole, a valve body mounting hole, a first spring supporting surface and a valve body supporting surface, the umbrella-shaped valve is arranged on the valve body supporting surface, the hollow guide rod penetrates through the valve body mounting hole and is connected with the piston, the piston is provided with an air cylinder inlet hole and a second spring supporting surface, the spring is arranged between the first spring supporting surface and the second spring supporting surface, the cylinder barrel is of a single-opening structure, the opening end of the cylinder barrel is fixedly connected with the valve seat, the spring and the piston are arranged in the cylinder barrel, and the side wall of the cylinder barrel, which is close to the valve seat, is provided with a plurality of air guide holes.

Description

Exhaust valve and electric automobile

Technical Field

The invention relates to the field of electric automobiles, in particular to an exhaust valve and an electric automobile.

Background

The electric vehicle (BEV) is a vehicle which takes a vehicle-mounted power supply as power and drives wheels by a motor to run, meets various requirements of road traffic and safety regulations, can accommodate a plurality of battery cells, and further isolates the battery cells from passengers by a sealing cover plate; the battery compartment of sealed apron and automobile body structure is airtight relatively, satisfies IP67 protection level usually, and the purpose is to avoid electric core to receive the interference of outside dust, liquid, and the leakproofness also causes the ventilation rate of battery compartment and outside to be restricted simultaneously.

The battery core is likely to be overheated, collided, extruded and the like in the charging and driving processes of the electric automobile and further causes thermal runaway, the pressure of the battery compartment is increased along with the release of a large amount of gas and heat when the thermal runaway of the battery core is caused, and the sealing cover plate bears too much pressure or harmful gas flows into the passenger compartment to cause damage to passengers. In order to avoid explosion or gas leakage from a sealing cover plate caused by too large pressure borne by a sealed battery compartment, an exhaust valve is required to be configured for active pressure relief, and the gas in the battery compartment is led out of the vehicle in a safe path; based on the structural characteristics and safety requirements of the battery compartment, the exhaust valve is required to meet the requirements of sealing performance, proper opening pressure, a large enough pressure relief cross section and automatic closing after the pressure relief and the exhaust of the battery core are finished.

At present, a spring-opening exhaust valve or an ejector pin blasting exhaust valve is mostly applied to a battery compartment, and the spring-opening exhaust valve is characterized in that a pressure relief section is increased along with the increase of the opening stroke of a valve, and the increase of the opening stroke needs to overcome the increase of the elastic force of a spring, so that the pressure intensity in the battery compartment is higher, and the pressure relief efficiency is low; the explosion pressure of thimble blasting formula discharge valve is great, and the explosion pressure uniformity is relatively poor, and the box is internal and external to communicate with each other after the ventilated membrane breaks, and outside a large amount of oxygen gets into the battery compartment and participates in the reaction and can make the inside burning that takes place once more of battery compartment, and the security is not high.

Disclosure of Invention

Based on this, the invention aims to provide an exhaust valve to solve the problems of low pressure relief efficiency and low safety in the process of exhausting and relieving pressure of a battery compartment in the prior art.

The invention provides an exhaust valve for exhausting and decompressing equipment, which comprises a valve body, a valve seat, a spring, a piston and a cylinder barrel, wherein the valve body comprises an umbrella-shaped valve and a one-way valve, the umbrella-shaped valve is provided with a breathable film and a hollow guide rod, the side wall of the hollow guide rod is provided with a plurality of vent holes, the end part of the hollow guide rod is provided with a one-way valve fixing hole and an air inlet hole, the valve seat is provided with an exhaust hole, a valve body mounting hole, a first spring supporting surface and a valve body supporting surface, the umbrella-shaped valve is arranged on the valve body supporting surface, the hollow guide rod penetrates through the valve body mounting hole and is connected with the piston, the piston is provided with an air cylinder air inlet hole and a second spring supporting surface, the spring is arranged between the first spring supporting surface and the second spring supporting surface, the cylinder barrel is of a single-opening structure, the opening end of the cylinder barrel is fixedly connected with the valve seat, the spring and the piston are arranged in the cylinder barrel, and the side wall close to the valve seat is provided with a plurality of air guide holes.

The invention has the beneficial effects that: by arranging the valve body, the valve seat, the spring, the piston and the cylinder, when the gas pressure in the equipment changes within a normal range, the inside of the equipment can exchange gas with the outside through the gas guide hole, the vent hole and the gas permeable film; when the gas pressure in the equipment is abnormally increased violently, the gas in the equipment can exchange with the external gas through the gas guide hole, the vent hole and the gas permeable membrane, further, the high-pressure gas in the equipment is applied to the inner surface of the valve body to generate thrust, the tension of the spring is overcome, the spring is stretched to separate the umbrella-shaped valve from the valve body supporting surface and generate a gap, the high-pressure gas in the equipment exchanges with the external gas through the vent hole and the gap to accelerate the discharge rate of the high-pressure gas, further, the high-pressure gas in the equipment can enter the cylinder between the cylinder barrel and the piston through the gas guide hole, the vent hole, the one-way valve, the gas inlet hole and the gas inlet hole of the cylinder, the temperature of the gas in the cylinder is increased through paths such as convection, heat radiation and the like, the gas in the cylinder expands when heated to further push the piston to move, so that the gap between the umbrella-shaped valve and the valve body supporting surface is increased, the flow cross section of the gas in the equipment is increased, the discharge rate of the high-pressure gas is further accelerated, and after the high-pressure gas is discharged, the umbrella-shaped valve and the gap and the valve body supporting surface are gradually closed under the action of the spring to recover to a normal gas exchange state.

Preferably, the valve body further comprises a protective cover, and the umbrella-shaped valve is further provided with an upper sealing surface, a lower sealing surface, a limiting surface and a flange; the ventilated membrane is arranged on the upper sealing surface, the limiting surface is in contact with the valve body supporting surface and used for limiting the stroke of the valve body, the protective cover is arranged on the flange, and a plurality of air holes are formed in the flange along the circumferential direction.

Preferably, the check valve comprises a fixing column and a diaphragm arranged at one end of the fixing column, the fixing column is in interference fit with the check valve fixing hole, a stop block extends from the other end of the fixing column, the cross section of the stop block is larger than that of the check valve fixing hole, and the cross section of the diaphragm is larger than that of the air inlet hole.

Preferably, the valve seat is further provided with a first sealing element accommodating groove, a second sealing element accommodating groove and a fixing hole, a first sealing element is arranged in the first sealing element accommodating groove, a second sealing element is arranged in the second sealing element accommodating groove, the first sealing element is in contact with the lower sealing surface, and the valve seat is fixed on the equipment through the fixing hole.

Preferably, be equipped with the annular on the lateral wall of piston, the cylinder inlet port is kept away from the tip of disk seat is equipped with the installation drive hole of coaxial and cross sectional shape difference, be equipped with the third sealing member in the annular, the third sealing member with the inner wall sliding connection of cylinder.

Preferably, the surface of the third sealing element is provided with a lubricant for reducing friction between the third sealing element and the inner wall of the cylinder barrel.

Preferably, the hollow guide rod is provided with an external thread, the air inlet hole of the air cylinder is provided with an internal thread, and the hollow guide rod is connected with the piston through a thread.

Preferably, a plurality of radiating fins are arranged on the outer side wall, close to the closed end, of the cylinder barrel along the circumferential direction.

Preferably, the check valve is made of silicone.

In another aspect, the invention provides an electric vehicle, which comprises the exhaust valve.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

FIG. 1 is an exploded view of a vent valve according to a first embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of the exhaust valve body according to the first embodiment of the present invention;

FIG. 3 is a first perspective view of the exhaust valve body according to the first embodiment of the present invention;

FIG. 4 is a second perspective view of the exhaust valve body according to the first embodiment of the present invention;

FIG. 5 is a schematic view of the piston structure of the exhaust valve according to the first embodiment of the present invention;

FIG. 6 is a first perspective view of the valve seat of the exhaust valve according to the first embodiment of the present invention;

FIG. 7 is a second perspective view of the valve seat of the exhaust valve in accordance with the first embodiment of the present invention;

FIG. 8 is a cross-sectional view of the valve seat of the exhaust valve according to the first embodiment of the present invention;

FIG. 9 is an enlarged partial cross-sectional view of the valve body of the exhaust valve in accordance with the first embodiment of the present invention;

FIG. 10 is an enlarged partial cross-sectional view of the check valve inlet condition of the exhaust valve in accordance with the first embodiment of the present invention;

FIG. 11 is a schematic cross-sectional view of the gas exchange of the exhaust valve of the first embodiment of the present invention under normal operation;

FIG. 12 is a schematic cross-sectional view of the gas exchange under abnormal operation of the exhaust valve according to the first embodiment of the present invention;

FIG. 13 is a graph showing the temperature of the gas in the cylinder, the opening stroke of the valve body, and the pressure variation in the exhaust valve according to the first embodiment of the present invention;

FIG. 14 is a schematic view of a discharge valve according to a second embodiment of the present invention;

FIG. 15 is a schematic cross-sectional view of a discharge valve in accordance with a second embodiment of the present invention;

FIG. 16 is a schematic view showing the construction of the device of the present invention in which the exhaust valve is installed;

FIG. 17 is a schematic view, partly in section, of the device of the invention with the exhaust valve installed;

FIG. 18 is a schematic view of an electric vehicle equipped with an exhaust valve according to the present invention;

FIG. 19 is a schematic view, partially in section, of an electric vehicle incorporating an exhaust valve according to the present invention;

description of the main element symbols:

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the following detailed description will further illustrate the invention in conjunction with the above-described figures.

Detailed Description

To facilitate an understanding of the invention, the invention will now be described more fully hereinafter with reference to the accompanying drawings. Several embodiments of the invention are presented in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

As shown in fig. 1 to 13, there is shown a vent valve 1 according to a first embodiment of the present invention, for venting and depressurizing a device 2, the vent valve 1 comprising: the valve body 11, the valve seat 12, the spring 13, the piston 14 and the cylinder 15; as shown in fig. 2, 3, 4 and 9, the valve body 11 comprises an umbrella valve 111, a gas permeable membrane 112, a protecting cover 113 and a one-way valve 114; the umbrella-shaped valve 111 is provided with a hollow guide rod 1111, an upper sealing surface 1112, a lower sealing surface 1113, a limiting surface 1114, a flange 1115 and a vent 1116; one or more vent holes 1117 are formed in the wall surface of the hollow guide rod 1111 of the umbrella valve 111; the umbrella valve 111 is provided with a check valve fixing hole 1118, an air inlet hole 1119 and a check valve 114 which are matched to realize a one-way air inlet function. The check valve 114 is provided with a fixing column 1142 and a diaphragm 1141; the fixing posts 1142 engage the check valve fixing holes 1118 of the umbrella valve 111 to fix the check valve 114 to the umbrella valve 111.

The check valve 114 may be constructed of a high temperature resistant flexible material; optionally, the check valve 114 is made of silica gel, and the temperature resistance of the silica gel can reach 350 ℃, which helps the exhaust valve 1 to avoid the check valve 114 from melting or bonding with the umbrella valve 111 in a high-temperature environment; on the other hand, the elastomeric nature of the silicone facilitates interference mounting of the fixation post 1142 to the one-way valve fixation hole 1118 of the umbrella valve 111; it will be readily appreciated that although the anchor posts 1142 have a partial area with a diameter greater than the diameter of the check valve fixing hole 1118, the easily crushable anchor posts 1142 may simply be inserted into the check valve fixing hole 1118 and fixed; referring to FIG. 10, when the air intake hole 1119 is intake, the diaphragm 1141 of the check valve 114 can swing to open to reduce the intake resistance, A in FIG. 10 ₂ The intake path is shown with the diaphragm 1141 of the check valve 114 open. When air is not supplied to air inlet hole 1119, diaphragm 1141 of check valve 114 abuts against the bottom surface of umbrella valve 111 to increase the resistance of air discharged from air inlet hole 1119, as shown in FIG. 9A ₁ The path of the gas exiting from the inlet hole 1119 is shown, and at this time, the diaphragm 1141 of the check valve 114 is closed, and although the check valve 114 and the umbrella valve 111 do not form an absolute sealing state, the diaphragm 1141 of the umbrella valve 111 is tightly attached to the umbrella valve 111, so that the flow cross section of the gas exiting is small, and accordingly the exhaust resistance is large, which means that the gas can only pass through the check valve 114 at a small flow rate. It should be understood that the prior art supports a variety of one-way valve 114 configurations, just one of which.

The gas permeable membrane 112 is mounted on the upper sealing surface 1112 of the umbrella valve 111, and the exhaust valve 1 is mounted in the interior space 111a of the umbrella valve 111 after the apparatus can exchange external gas through the gas permeable membrane 112, while the gas permeable membrane 112 blocks external liquid from entering the interior space 111a of the umbrella valve 111. The internal space 111a is communicated with the vent hole 1117 on the wall surface of the hollow guide rod 1111, that is, the gas in the vent hole 1117 can be exhausted out of the exhaust valve 1 through the gas permeable membrane 112, the gas outside the exhaust valve 1 can also enter the vent hole 1117 through the gas permeable membrane 112, and the gas inflow or exhaust is driven by the pressure difference at both sides of the gas permeable membrane 112. Preferably, the breathable film 112 is an expanded polytetrafluoroethylene film, and the expanded polytetrafluoroethylene film has good air permeability and can prevent liquid water and oil from passing through; alternatively, the vented membrane 112 is secured to the upper sealing surface 1112 of the umbrella valve 111 by an adhesive or welding process.

The protective cover 113 is mounted on the flange 1115 of the umbrella valve 111, and the connecting mode of the protective cover 113 and the flange 1115 can be welding, bonding and the like; the protecting cover 113 is used to protect the air permeable membrane 112 from undesired foreign objects or impact force, such as water impact or sharp object penetration; the protective cover 113 avoids direct impact of external high-pressure water flow on the breathable film 112, further avoids impact fracture of the breathable film 112 in a high-pressure water gun impact test, and further facilitates the exhaust valve 1 to pass an IPX9K protection level test. One or more air holes 1116 are formed in the flange 1115, so that the cavity 113a between the protective cover 113 and the air permeable membrane 112 is communicated with the outside of the umbrella-shaped valve 111. In FIG. 11, the dotted arrow K ₁ The gas flow path in the gas permeable state is illustrated, and it is easily understood that the gas may follow the broken-line arrow K ₁ The opposite direction, depending on the pressure differential across the vented membrane 112.

As shown in fig. 6, 7 and 8, the valve seat 12 is provided with a discharge hole 121, a valve body mounting hole 122, a first seal receiving groove 123, a second seal receiving groove 124, a first seal 125, a second seal 126, a fixing hole 127, a first spring support surface 128 and a valve body support surface 129; the first seal 125 is mounted to the first seal receiving groove 123 and the second seal 126 is mounted to the second seal receiving groove 124.

Referring to fig. 5 and 12, the piston 14 is provided with a piston body 141 and a third sealing member 142, and the piston body 141 is provided with a ring groove 1411, a cylinder inlet hole 1412, a mounting driving portion 1413 and a second spring support surface 1414. Third seal 142 is mounted to ring groove 1411 of piston body 141. Alternatively, the mounting driving portion 1413 may be a hexagonal hole that can be engaged with an allen wrench to be driven to rotate by the allen wrench.

As shown in fig. 11, the outer surface of the hollow guide 1111 of the umbrella valve 111 is engaged with the valve body mounting hole 122 of the valve seat 12 and is configured to be slidably connected with each other, and preferably, the hollow guide 1111 is loosely engaged with the valve body mounting hole 122; the hollow guide rod 1111 is provided with a first fixing port at one end far away from the limiting surface 1114, and the first fixing port is connected with the piston 14. The hollow guide 1111 and the piston 14 may be connected by bonding, snap-fitting, or thread-fitting, for example, the first fixing opening is provided with an external thread, the cylinder air inlet hole 1412 of the piston body 141 of the piston 14 is provided with an internal thread, that is, the cylinder air inlet hole 1412 is partially configured as a nut, and further, the piston 14 is driven to rotate by a hexagon socket wrench and the piston 14 is screwed on the hollow guide 1111; i.e. the piston 14 is in a fixed connection with the valve body 11.

Referring to fig. 11, the spring 13 is disposed between the valve seat 12 and the piston 14, and two ends of the spring 13 are respectively in contact with the first spring support surface 128 of the valve seat 14 and the second spring support surface 1414 of the piston 14; the spring 13 is in a compressed state after the piston 14 is connected to the valve body 11. The first resilience F1 of the spring 13 is applied to the second spring support surface 1414 of the piston 14 and further pushes the limit surface 1114 of the umbrella valve 111 to fit the valve body support surface 129 of the valve seat 12 through the hollow guide rod 1111 fixedly connected with the piston 14; defined by the geometry of the umbrella valve 111 and the valve seat 12, when the stop surface 1114 of the umbrella valve 111 abuts the valve body support surface 129 of the valve seat 12, the lower sealing surface 1113 of the umbrella valve 111 cooperates with the first seal 125 and compresses the first seal 125 to a suitable dimension, such as a height of 30% of the first seal 125, further satisfying that the lower sealing surface 1113 of the umbrella valve 111 and the first sealing surface of the first seal 125 are configured to meet the sealing requirements, such as no water infiltration under 1 meter of water for 24 hours. Preferably, the first seal 125 is made of an elastomer material such as rubber or silicone, that is, the first seal 125 is easily compressed and deformed, and generates a continuous resilient force to the lower seal surface 1113 after being compressed and deformed, and the first seal 125 closely contacts the lower seal surface 1113 by the resilient force to perform a sealing function. It should be understood that the first resilient force F1 should be large enough to prevent the valve body 11 from separating from the valve seat under the action of vibration and impact force. For example, if the mass of the valve body 11 is 40 g, and the valve body 11 may be subjected to a vibration impact with an acceleration of 30m/s2, the first resilient force F1 should be greater than 1.2N.

As shown in FIGS. 11 and 12, the cylinder 15 is opened toward the valve body 11 along the axis of the hollow guide 1111 (X in FIG. 12) ₁ The orientation shown) and the piston 14 is placed inside the cylinder 15, the inner wall of the cylinder 15 and the third seal 142 of the piston 14 being in interference fit and configured to be slidably connected to each other, i.e. the third seal 142 is in a compressed state inside the cylinder 15; preferably, the third sealing member 142 is constructed of a silicone material. Alternatively, the third seal 142 is in a state of being compressed by 20% inside the cylinder 15, thereby ensuring that the piston 14 slides with a small frictional resistance against the cylinder 15 while avoiding air leakage between the third seal 142 and the inner wall of the cylinder 15. The piston 14, the check valve 114, and the inner wall of the cylinder tube 15 are configured as a cylinder 15a, and the check valve 114 makes the cylinder 15a small in intake resistance and large in exhaust resistance, i.e., the cylinder 15a has a small leakage flow rate. Preferably, the inner wall of the cylinder 15 has a small surface roughness, i.e., the inner wall of the cylinder 15 is smooth to reduce the frictional resistance of the piston 14 to slide relative to the cylinder 15. Preferably, the surface of the third seal 142 is applied with an appropriate amount of lubricant so as to reduce the frictional resistance of the piston 14 sliding against the cylinder tube 15, and on the other hand, the lubricant contributes to improving the sealability between the third seal 142 and the inner wall of the cylinder tube 15, that is, the sealability of the cylinder 15a. The wall surface of the cylinder 15 is provided with one or more air guide holes 151, and the air guide holes 151 are arranged in the area outside the movement stroke range of the piston 14, namely, the piston 14 slides relative to the cylinder 15 without contacting the air guide holes 151, so that air leakage of the cylinder 15a is caused. It will be readily appreciated that the normal sliding travel of the piston 14 is limited by the spring 13, the construction of the piston 14, the construction of the valve body 11 and the construction of the valve seat 12. The open end of the cylinder 15 is connected to the valve seat 12, optionallyThe open end of the cylinder 15 is welded to the first spring support surface 128 of the valve seat 12, thereby fixedly connecting the cylinder 15 to the valve seat 12.

In the present embodiment, the device 2 is configured as a sealed space by the box body 21 and the box cover 22, the exhaust valve 1 is fixed to the box body 21 of the device 2 through the fixing hole 127 on the valve seat 12 by the second fastener 25, the second sealing element 126 and the box body 21 of the device 2 are configured as a second sealing surface, and the geometric dimension of the second sealing element accommodating groove 124 defines that the second sealing element 126 is compressed to a proper size in the installation state of the exhaust valve 1, for example, the height of the second sealing element 126 is compressed by 30%; further satisfy the second sealed face and satisfy waterproof leakproofness requirement, specifically, in this embodiment, satisfy equipment 2 submergence 1 meter under water and keep 24 hours not can not have water to infiltrate from the second sealed face. The sealed face of ventilated membrane 112, first sealed face and second all satisfies waterproof sealing nature requirement, and then guarantees that the equipment 2 of installation discharge valve 1 can not cause waterproof performance to destroy because of discharge valve 1, for example the battery package of assembly discharge valve 1 requires the submergence to maintain 24 hours under water 1 meter of degree of depth and does not have the water infiltration.

An exhaust valve 1 is arranged on the box body 21; when the temperature of the device 2 changes, the altitude changes, and the like, and the gas pressure in the device 2 changes within a normal range, the inside of the device 2 exchanges gas with the outside of the device 2 through the gas guide hole 151 of the cylinder 15 of the exhaust valve 1, the vent hole 1117 of the hollow guide rod 1111, the gas permeable membrane 112 and the vent hole 1116, that is, the gas flows into or is discharged out of the device 2 under the driving of the internal and external pressure difference of the device 2, thereby ensuring that the internal pressure and the external pressure of the device 2 are equal, and avoiding the deformation damage such as the bulging or the sinking of the box body 21 or the box cover 22 of the device 2. Specifically, in the embodiment, the internal-external pressure difference of the equipment 2 is 1kPa, and the ventilation rate of the breathable film 112 is 0.5L/min; as the pressure difference between the inside and the outside of the apparatus 2 increases, the ventilation rate of the vented membrane 112 increases, the ventilation characteristic of the vented membrane 112 can be described by a pressure-flow curve, the ventilation characteristic of the vented membrane 112 is determined by the microscopic characteristics of the material itself, and the prior art can customize vented membranes 112 with different ventilation characteristics by the process. In FIG. 11, the dotted arrow K ₁ The gas flow path in the gas permeable state is shown, which is easy to understandThe body may also follow the dotted arrow K ₁ The opposite direction, depending on the pressure differential across the vented membrane 112.

Specifically, in this embodiment, the device 2 accommodates a plurality of battery cells 3, each battery cell 3 is a ternary lithium battery, and the battery cells 3 are out of control due to heat, mechanical abuse, short circuit and other situations; the device 2 can be installed on an electric automobile to provide electric energy for the electric automobile to run, the overheating can occur under the condition of quick charging of the electric automobile, mechanical abuse can occur under the condition of collision or mechanical penetration in the running process of the electric automobile, and a short circuit can occur under the condition that the electric automobile is extruded or a conductive medium enters the device 2. The pressure in the equipment 2 is further increased by the thermal runaway of the battery core 3 accompanied by the release of a large amount of gas and heat, for example, 200L of gas is discharged in 15 seconds after the thermal runaway of a ternary lithium battery with the capacity of 150Ah, and the temperature of the discharged gas may exceed 1000 ℃ at most; when the temperature in the device 2 equipped with the exhaust valve 1 is sharply increased to expand the gas volume or generate a large amount of gas, for example, the gas generation rate is 800L/min, it is easily understood that, although the gas permeable membrane 112 plays a role of exhausting gas, the gas exhaust rate of the gas permeable membrane 112 is much smaller than the gas generation rate, for example, the gas permeable rate of the gas permeable membrane 112 is 0.5L/min; the venting rate of the gas permeable membrane 112 is not sufficient to timely vent the gases generated inside the apparatus 2, and accordingly the pressure inside the apparatus 2 may increase dramatically. With reference to fig. 11, 12, the pressure inside the device 2 exerted on the inner surface of the valve body 11 generates a first pushing force F ₂ First urging force F ₂ In the direction of action of and a first resilient force F exerted by the spring 13 on the piston 14 ₁ In opposite directions; specifically, the equivalent area S of the inner surface of the valve body 11 receiving the air pressure is 5cm ² And the pressure P inside the device 2 is 4kPa, the first urging force F2= S × P =2N. When the first pushing force F ₂ Greater than the first return force F1 of the spring 13, e.g. F ₂ Is 2N, F ₁ Is 1.2N, the first driving force F ₂ Against the first return force F of the spring 13 ₁ Pushing the valve body 11 to X as shown in FIG. 12 ₁ The direction of movement is such that the lower sealing surface 1113 of the umbrella valve 111 moves away from the first seal 125 and a gap H is created between the lower sealing surface 1113 and the first seal 125 ₁ The pressure relief path of the exhaust valve 1 is opened, as shown by arrow K in fig. 12 ₂ Illustrating the pressure relief state gas flow path. The valve body 11 further compresses the spring 13 by the piston 14 during the above movement, and the further compressed spring 13 generates a second return force F ₃ . When the pressure inside the device 2 reaches the opening threshold of the exhaust valve 1, the valve body 11 of the exhaust valve 1 is opened to exhaust the gas inside the device 2, and the gas flows to the outside of the device 2 through the exhaust hole 121 of the valve seat 12 and further along the lower sealing surface 1113 of the umbrella valve 111; as shown in FIG. 12, the gap height H between the lower sealing surface 1113 of the umbrella valve 111 and the first seal 125 is ₁ A flow cross section for restricting gas discharge, and a gap height H between the lower seal surface 1113 of the umbrella valve 111 of the valve body 11 and the first seal 125 ₁ The larger the flow cross section of the gas discharge, i.e. the greater the pressure relief rate inside the device 2 under the same pressure conditions; otherwise, the gap height H ₁ The smaller the flow cross section of the gas discharge, i.e. the smaller the pressure relief rate inside the device 2 under the same pressure conditions; based on the safety and cost requirements of the device 2, the desired effect is that the venting valve 1 has a sufficient venting rate such that the tank 21 and the lid 22 of the device 2 are subjected to as little pressure as possible, since the lighter and thinner design of the tank 21 and the lid 22 is advantageous for cost reduction and weight reduction.

The movement of the lower sealing surface 1113 of the umbrella valve 111 away from the first seal 125 of the valve body 11 causes the piston 14 to further compress the spring 13, and further compression of the compressed spring 13 generates a second rebound force F ₃ First urging force F ₂ And a second rebound force F ₃ When equal, the valve body 11 maintains the relative position with respect to the valve seat 12 and does not move any more, i.e. the valve body 11 is kept in a static state by force balance. In one embodiment, the spring 13 has a stiffness coefficient μ of 0.8N/mm and the first urging force F ₂ 2N, the first resilience F of the initial compression state of the spring ₁ At 1.2N, the spring 13 generates a second rebound force F ₃ The compression amount is L relative to the first resilience F1, and F is known from Hooke's law ₃ ＝F ₁ + L, i.e. the first thrust F when the spring 13 generates a compression L of 1mm ₂ And a second rebound force F ₃ Are equal. Referring to FIG. 12, the umbrella valve is now in use111 is displaced by the same amount as the compression L of the spring 13, i.e. the gap height H ₁ And (L). It should be understood that the production of gas/heat and the venting of pressure inside the apparatus 2 is a dynamic equilibrium process, the first driving force F varying with the pressure inside the apparatus 2 ₂ Following the change, the first propulsion force F ₂ And a second rebound force F ₃ Will move to a new relative position with respect to the valve seat 12 under the combined action of the first urging force F ₂ And a second rebound force F ₃ An equal state; it will be readily appreciated that the amount of compression L generated by the spring 13 during the movement of the valve body 11 varies. Second rebound force F of the spring 13 ₃ The movement position of the valve body 11 is limited, and the gap height H is further limited ₁ I.e. the pressure relief flow cross section of the outlet valve 1 is limited.

As shown in fig. 9, 10, 12 and 17, the opening process of the valve body 11 drives the piston 14 to slide relative to the cylinder 15 along the opening direction of the valve body 11, i.e. the piston 14 slides along X ₁ The direction is indicated to slide; during the movement of the piston 14, the gas passes through the gas guide hole 151 of the cylinder barrel 15 and the vent hole 1117 on the wall surface of the hollow guide rod 1111, further passes through the one-way valve 114, and then enters the cylinder 15a through the cylinder air inlet hole 1412 in the middle of the piston 14; the diaphragm 1141 of the check valve 114 is opened in the intake process of the cylinder 15a as shown in fig. 10, so that the gas flows into the cylinder 15a with low flow resistance. In the hot gas discharging process in the equipment 2, the cylinder barrel 15 is heated through a convection and radiation heat exchange path, so that the temperature of the gas in the cylinder 15a is further increased; the gas in the cylinder 15a expands due to heat to increase the pressure in the cylinder 15a, so as to push the piston 14 to slide along the opening direction of the valve body 11 relative to the cylinder 15, and the valve body 11 connected with the piston 14 also moves along the opening direction of the valve body, i.e. the expansion of the gas in the cylinder 15a pushes the valve body 11 to further move along the direction X ₁ Indicating directional motion. Obviously, the process that the gas in the cylinder 15a expands due to heat to push the piston 14 to move increases the gap between the lower sealing surface 1113 of the umbrella valve 111 of the valve body 11 and the first sealing element 125, and increases the flow cross section of the gas exhaust; that is, the pressure relief rate is increased under the same pressure condition in the apparatus 2, and further the gas discharge resistance in the casing 2 is decreased and/or the gas discharge flow rate is increased, thereby avoiding the tank body 21 and the tank of the apparatus 2The cover 22 is subjected to too much pressure to explode. Advantageously, the cylinder 15 heated by the hot air flow expands the air in the cylinder 15a, and then the piston 14 pushes the valve body 11 to move, so as to increase the flow cross section of the exhausted air, and under the constraint condition of limited pressure relief rate, the pressure resistance requirements of the box body 21 and the box cover 22 of the device 2 are reduced, that is, the box body 21 and the box cover 22 of the device 2 can be designed to be lighter and thinner and meet the pressure resistance requirements at the same time, so that the box body 21 and the box cover 22 of the device 2 are provided with greater design freedom in material, thickness and the like, and the weight and the cost are reduced.

As shown in fig. 9, 10, 12, 13, 16 and 17, the apparatus 2 is configured to be a sealed space by a case 21 and a case cover 22, and the case 21 and the case cover 22 may be connected by a plurality of first fastening members 23, preferably, a sealing medium is provided between the case 21 and the case cover 22; the box body 21 is provided with an exhaust valve 1, and optionally, the box body 21 is provided with a connector 24 for energy/signal transmission; a plurality of electric cores 3 are accommodated in the housing of the device 2, the electric cores 3 are provided with the explosion-proof valves 31, the plurality of electric cores 3 form a high-voltage loop in a series/parallel connection mode and perform energy transmission with the power consumption/supply equipment through the connectors 24, for example, the device 2 is installed on an electric vehicle to output electric energy for the operation of the electric vehicle, and the electric energy is supplemented through charging piles after the energy stored in the device 2 is consumed. The electric core 3 generates thermal runaway under the conditions of overheating, mechanical abuse, short circuit and the like, the pressure in the shell is further increased along with the release of a large amount of gas and heat due to the thermal runaway of the electric core 3, the overheating may occur under the condition of quick charging of the electric automobile, the mechanical abuse may occur under the condition of collision or mechanical penetration of the electric automobile in the driving process, and the short circuit may occur under the condition of extrusion of the electric automobile or the entering of a conductive medium into the equipment 2. When the pressure in the device 2 reaches the opening threshold of the exhaust valve 1, the valve body 11 of the exhaust valve 1 is opened to exhaust the gas in the device 2. The exhaust valve 1 has a spring 13 with a stiffness coefficient mu of 0.8N/mm, a spring 13 with a first resilience F1 of 1.2N in an initial state, and an inner surface of the valve body 11 having an equivalent area S for receiving air pressure of 5cm ² (ii) a A plurality of battery cells 3 are accommodated in the equipment 2, the battery cells 3 are ternary lithium batteries, and the battery cells 3 are out of control due to heat generated under the conditions of overheating, mechanical abuse, short circuit and the like; electric core 3 heat lossThe average gas production rate in 25 seconds after control is 800L/min. When the pressure in the equipment 2 reaches the opening threshold of the exhaust valve 1, the valve body 11 of the exhaust valve 1 is opened to exhaust the hot gas in the equipment 2, the flow path of the hot gas is indicated by an arrow K2 in FIG. 12, and the process of exhausting the gas in the equipment 2 through the exhaust valve 1 is indicated by FIG. 17; the hot gas flows through the exhaust holes 121 of the valve seat 12 further along the gap between the lower sealing surface 1113 of the umbrella valve 111 and the first seal 125 to the outside of the apparatus 2; in the high-temperature airflow flow path, the high-temperature airflow flow path and the cylinder barrel 15 of the exhaust valve 1 are subjected to convective heat exchange and radiation heat exchange so as to heat the cylinder barrel 15 of the exhaust valve 1, and further the temperature of the gas in the cylinder 15a is increased; the gas in the cylinder 15a expands when heated to increase the pressure in the cylinder 15a, thereby pushing the piston 14 to slide relative to the cylinder 15 along the opening direction of the valve body 11, and the valve body 11 connected to the piston 14 also moves along the opening direction of the valve body, i.e. the expansion of the gas in the cylinder 15a pushes the valve body 11 to further move along the direction X ₁ Indicating directional motion. Obviously, the process of the gas in the cylinder 15a expanding by heat to push the piston 14 to move increases the gap between the lower sealing surface 1113 of the umbrella valve 111 of the valve body 11 and the first sealing element 125, and increases the flow cross section of the gas exhaust; that is, the pressure relief rate is increased under the same pressure condition in the equipment 2, and further, the gas discharge resistance in the equipment 2 is decreased and/or the gas discharge flow rate is increased, thereby preventing the case body 21 and the case cover 22 of the equipment 2 from being exposed to too much pressure to explode.

The curve T in FIG. 13 illustrates the variation of the temperature of the gas in the cylinder 15a, in the embodiment in which the temperature of the gas in the cylinder 15a is heated from 35 ℃ to 177 ℃ at the maximum, which in turn causes the pressure in the cylinder 15a to increase; curve P shows the variation of the pressure inside the cylinder 15a, the pressure inside the cylinder 15a reaching 17kPa, the diameter of the piston 14 being 15mm, the thrust F of the piston 14 being at this time ₄ And 3N, i.e. the stroke h = F4/μ =3.75mm by which the gas in the cylinder 15a is thermally expanded to push the piston 14 to move. Curve L in fig. 15 ₁ The stroke of the valve body of the comparative example is illustrated, wherein the comparative example is different from the embodiment in that the end of the hollow guide 1111 of the comparative example is closed, the check valve fixing hole 1118 is not provided, the air intake hole 1119 does not include the check valve 11, and the stroke of the piston 14 of the comparative example is limited only by the rebound of the springForce, L ₂ The stroke of the valve body 11 of the embodiment is shown at t ₁ At the moment, the valve body stroke of the comparative example is h ₁ The stroke of the valve body 11 of the embodiment is h ₂ ，h ₂ ＝h ₁ + h, the stroke of the valve body 11 is increased by the process that the gas in the cylinder 15a expands due to heat to push the piston 14 to move, i.e. the gap between the lower sealing surface 1113 of the umbrella valve 111 and the first sealing element 125 is increased, and the flow cross section for discharging the gas is increased. In fig. 15, a curve S1 shows the pressure in the comparative example apparatus, and a curve S2 shows the pressure in the example apparatus 2, and since the stroke of the example valve body 11 is larger, the flow cross section of gas discharge is increased, and the gas discharge resistance in the apparatus 2 is further decreased, thereby decreasing the pressure in the apparatus 2.

The above device 2 accommodating multiple battery cells 3, the thermal runaway exhaust and pressure release process of a single battery cell 3 lasts about 25 seconds, after the pressure release and exhaust of the single battery cell 3 are finished, no high-temperature airflow heats the cylinder 15 of the exhaust valve 1, the temperature of the cylinder 15 gradually decreases due to the effects of heat conduction, heat convection, and the like, further the temperature of the gas in the cylinder 15a decreases, that is, the pressure of the cylinder 15a decreases, so that the piston 14 slides relative to the cylinder 15 along the closing direction of the valve body 11, and the valve body 11 connected with the piston 14 also moves along the closing direction of the valve body 11; meanwhile, the check valve 114 enables the air cylinder 15a to have small-flow air leakage, and the pressure in the air cylinder 15a is gradually reduced under the double effects of temperature reduction and leakage; the spring 13 pushes the piston 14 to slide relative to the cylinder 15 along the closing direction of the valve body 11, and the valve body 11 connected with the piston also moves along the closing direction of the valve body 11; until the limit face 1114 of the umbrella valve 111 is jointed with the valve body supporting face 129 of the valve seat 12, the piston 14 and the valve body 11 stop moving; the first resilient force F1 of the spring 13 is applied to the second spring support surface 1414 of the piston 14, and the lower sealing surface of the umbrella valve 111 engages the 1113 first seal 125 and compresses the first seal 125 by a set proportion, for example, by compressing the first seal 125 by 30% to a high degree, i.e., by closing the valve body 11 of the exhaust valve 1, to further restore the sealing performance of the exhaust valve 1. Inside valve body 11 of discharge valve 1 closed and can avoid outside oxygen to get into equipment 2, can avoid 2 outside air currents that contain oxygen of equipment to get into equipment 2 and then cause high temperature combustible to burn again, delay or avoided taking place heat to spread between a plurality of electric cores 3, withdraw for personnel and provide longer operating time with fire control processing etc. has improved the security of equipment. It is easy to understand that after the pressure relief and the exhaust of the single battery cell 3 are finished, the cavity inside the equipment 2 is filled with high-temperature combustible gas, and the combustible gas may contain carbon monoxide, ethane, propane and the like, but the combustible gas lacks a certain proportion of oxygen and does not have a condition of combustion or explosion inside the equipment 2. It should be understood that after the pressure relief and exhaust of a single electrical core 3 are finished, the high-temperature combustible gas filled in the cavity inside the device 2 exchanges heat with the outside through the box body 21 and the box cover 22, and meanwhile, the high-temperature combustible gas filled in the cavity inside the device 2 exchanges heat with a plurality of electrical cores 3 which are not out of thermal control, so that the high-temperature combustible gas filled in the cavity inside the device 2 is cooled, further, the pressure inside the device 2 is reduced, and the air outside the device 2 flows into the device 2 through the pressure relief channel under the condition that the valve body 11 of the exhaust valve 1 is not closed; the air outside the device 2 can only flow into the device 2 through the air-permeable membrane 112 with the valve body 11 of the degassing valve 1 closed, from which description it can be seen that the rate of ventilation of the air-permeable membrane 112 is relatively slow;

a second embodiment of the present invention also provides an exhaust valve, which is different from the exhaust valve provided in the first embodiment in that:

as shown in fig. 14 and 15, a plurality of heat dissipation fins 152 are disposed around the cylinder tube 15, and the heat dissipation fins 152 can increase the heat convection area between the hot air flow and the cylinder tube 15 during the exhaust and pressure relief process, so as to heat the cylinder tube 15 at a faster temperature rise rate, thereby heating the air in the cylinder 15a more quickly to expand the air and further push the piston 14 to move; thereby consuming shorter time to increase the stroke of the valve body 11 so as to obtain larger gas exhaust flow cross section and realize the improvement of the pressure relief effect.

The invention also provides an electric vehicle 4, wherein the electric vehicle 4 comprises the exhaust valve 1, as shown in fig. 18 and 19, a plurality of battery modules 42 are accommodated in a vehicle body 41 of the electric vehicle 4, a plurality of battery cells 3 are accommodated in each battery module 42, each battery cell 3 is provided with an explosion-proof valve 31, and the plurality of battery modules 42 form a high-voltage loop in a series/parallel mode to output electric energy for the operation of the electric vehicle 4And the electric energy stored in the battery module 42 is replenished through the charging pile after being consumed. Further isolating the battery module 42 from the occupant by a sealing cover 43; the sealing cover plate 43 and the vehicle body 41 form a relatively sealed battery compartment 41a, and optionally the battery compartment 41a meets the IP67 protection level, so as to prevent the battery module 42/the battery cell 3 from being interfered by external dust and liquid. The thermal runaway of the battery cell 3 occurs under the conditions of overheating, mechanical abuse, short circuit and the like, the pressure inside the battery compartment 41a is further increased along with the release of a large amount of gas and heat due to the thermal runaway of the battery cell 3, the overheating may occur under the condition of quick charging of the electric vehicle 4, the mechanical abuse may occur under the condition of collision or mechanical penetration during the driving process of the electric vehicle 4, and the short circuit may occur under the condition of collision and extrusion of the electric vehicle 4 or the entering of a conductive medium into the battery compartment 41 a. When the pressure in the battery compartment 41a reaches the opening threshold of the exhaust valve 1, the valve body 11 of the exhaust valve 1 is opened to exhaust the gas in the battery compartment 41 a. The high temperature gas flow heats the cylinder 15 of the exhaust valve 1, further raising the gas temperature in the cylinder 15a; the gas in the cylinder 15a expands due to heating to increase the pressure in the cylinder 15a, so as to push the piston 14 to slide along the opening direction of the valve body 11 relative to the cylinder 15, and the valve body 11 connected with the piston 14 also moves along the opening direction of the valve body 11; it is easy to understand that, the process that the gas in the cylinder 15a expands due to heat to push the piston 14 to move increases the gap between the lower sealing surface 1113 of the umbrella valve 111 of the valve body 11 and the first sealing member 125, and increases the flow cross section for the gas to be discharged; that is, the pressure discharge rate increases under the same pressure condition in the battery compartment 41a, and further the gas discharge resistance decreases and/or the gas discharge flow rate increases in the battery compartment 41 a; thereby preventing the gas leakage or explosion of the sealing cover plate 43 caused by too much pressure, and improving the safety of passengers. When the pressure relief and the exhaust of the battery cell 3 are finished, the cylinder 15 of the exhaust valve 1 is not heated by high-temperature airflow, the temperature of the cylinder 15 is gradually reduced under the action of heat conduction, heat convection and the like, the temperature of the gas in the cylinder 15a is further reduced, namely, the pressure of the cylinder 15a is reduced, so that the piston 14 slides relative to the cylinder 15 along the closing direction of the valve body 11, and the valve body 11 connected with the piston 14 also moves along the closing direction of the valve body; while the check valve 114 allows a small flow of air to be present in the cylinder 15aBody leakage, in which the pressure in the cylinder 15a is gradually reduced under the dual actions of temperature reduction and leakage; the spring 13 pushes the piston 14 to slide relative to the cylinder 15 along the closing direction of the valve body 11, and the valve body 11 connected with the piston also moves along the closing direction of the valve body 11; until the limit face 1114 of the umbrella valve 111 is jointed with the valve body supporting face 129 of the valve seat 12, the piston 14 and the valve body 11 stop moving; first resilience F of spring 13 ₁ Is applied to the second spring support surface 1414 of the piston 14, wherein the lower sealing surface of the umbrella valve 111 engages the first seal 125 of 1113 and compresses the first seal 125 by a set proportion, for example, by compressing the first seal 125 by 30% high, i.e., closing the valve body 11 of the exhaust valve 1, further restoring the sealing of the exhaust valve 1. The valve body 11 of the exhaust valve 1 is closed to prevent external oxygen from entering the battery compartment 41a, so that high-temperature combustible substances can be prevented from being combusted again when airflow containing oxygen outside the battery compartment 41a enters the battery compartment 41a, thermal spread among the plurality of battery cells 3 is delayed or avoided, and the safety of the electric vehicle 4 is improved.

It should be noted that the above implementation process is only for illustrating the applicability of the present application, but this does not mean that the exhaust valve of the present application has only the above implementation flow, and on the contrary, the exhaust valve of the present application can be incorporated into the feasible embodiment of the present application as long as the exhaust valve of the present application can be implemented.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. An exhaust valve is used for exhausting and decompressing equipment and is characterized in that: the valve comprises a valve body, a valve seat, a spring, a piston and a cylinder barrel, wherein the valve body comprises an umbrella-shaped valve and a check valve, the umbrella-shaped valve is provided with a breathable film and a hollow guide rod, the side wall of the hollow guide rod is provided with a plurality of air vents, the end part of the hollow guide rod is provided with a check valve fixing hole and an air inlet hole, the valve seat is provided with an exhaust hole, a valve body mounting hole, a first spring supporting face and a valve body supporting face, the umbrella-shaped valve is arranged on the valve body supporting face, the hollow guide rod penetrates through the valve body mounting hole and is connected with the piston, the piston is provided with an air cylinder air inlet hole and a second spring supporting face, the spring is arranged between the first spring supporting face and the second spring supporting face, the cylinder barrel is of a single-opening structure, the opening end of the cylinder barrel is fixedly connected with the valve seat, the spring is arranged in the cylinder barrel, and the cylinder barrel is close to the side wall of the valve seat.

2. The discharge valve according to claim 1, wherein: the valve body further comprises a protective cover, and an upper sealing surface, a lower sealing surface, a limiting surface and a flange are further arranged on the umbrella-shaped valve; the ventilated membrane is arranged on the upper sealing surface, the limiting surface is in contact with the valve body supporting surface and used for limiting the stroke of the valve body, the protective cover is arranged on the flange, and a plurality of air holes are formed in the flange along the circumferential direction.

3. The vent valve of claim 2, wherein: the check valve comprises a fixing column and a diaphragm arranged at one end of the fixing column, the fixing column is in interference fit with the check valve fixing hole, a stop block extends from the other end of the fixing column, the cross-sectional size of the stop block is larger than that of the check valve fixing hole, and the cross-sectional size of the diaphragm is larger than that of the air inlet hole.

4. The discharge valve according to claim 2, wherein: the valve seat is further provided with a first sealing element accommodating groove, a second sealing element accommodating groove and a fixing hole, a first sealing element is arranged in the first sealing element accommodating groove, a second sealing element is arranged in the second sealing element accommodating groove, the first sealing element is in contact with the lower sealing surface, and the valve seat is fixed on the equipment through the fixing hole.

5. The discharge valve according to claim 1, wherein: the piston is characterized in that an annular groove is formed in the outer side wall of the piston, the air inlet hole of the air cylinder is far away from the end portion of the valve seat, a mounting driving hole which is coaxial and different in cross-sectional shape is formed in the end portion of the valve seat, a third sealing element is arranged in the annular groove, and the third sealing element is connected with the inner wall of the cylinder barrel in a sliding mode.

6. The vent valve of claim 5, wherein: and the surface of the third sealing element is provided with a lubricant which is used for reducing the friction between the third sealing element and the inner wall of the cylinder barrel.

7. The discharge valve according to claim 5, wherein: the hollow guide rod is provided with external threads, the air inlet hole of the air cylinder is provided with internal threads, and the hollow guide rod is connected with the piston through threads.

8. The discharge valve according to claim 1, wherein: and a plurality of radiating fins are arranged on the outer side wall of the cylinder barrel close to the closed end along the circumferential direction.

9. The discharge valve according to claim 1, wherein: the check valve is made of silica gel.

10. An electric vehicle, characterized in that it comprises an exhaust valve according to any one of claims 1 to 9.